Pioneer Vintage Tuner F-91

Mohan Siribadda · 27th October 2011, 05:18 AM

I have forgotten to switch off my Pioneer F-91 AM/FM Tuner in inadvertently. Following morning, I noticed that the Tuner's power indicator ( or the led red light on the power switch) was on but the LCD display was not illuminated.

I pressed the preset station buttons, the tuner was not responding.

Can anyone help me to diagnose the problem so that I could bring back this fine tuner.

The Tuner service manual (URL) is attached.

Pioneer F91 Service Manual free download,schematics,datasheets,eeprom bins,pcb,repair info for test equipment and electronics

Cheers

Mohan

ticknpop · 27th October 2011, 05:41 AM

Test the power supply voltages as shown in the schematic. Hopefully you find something that needs repair. If not then it's some thing in the digital front end and/ or the display ( likely the digital front end and hard to find parts and troubleshoot. Good luck.

Mohan Siribadda · 27th October 2011, 05:43 AM

Thanks, I will checik

27th October 2011, 05:18 AM	#1
Mohan Siribadda diyAudio Member Join Date: Oct 2008 Location: Sri Lanka	Pioneer Vintage Tuner F-91 I have forgotten to switch off my Pioneer F-91 AM/FM Tuner in inadvertently. Following morning, I noticed that the Tuner's power indicator ( or the led red light on the power switch) was on but the LCD display was not illuminated. I pressed the preset station buttons, the tuner was not responding. Can anyone help me to diagnose the problem so that I could bring back this fine tuner. The Tuner service manual (URL) is attached. Pioneer F91 Service Manual free download,schematics,datasheets,eeprom bins,pcb,repair info for test equipment and electronics Cheers Mohan

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27th October 2011, 05:41 AM	#2
ticknpop diyAudio Member Join Date: May 2005 Location: toronto	Test the power supply voltages as shown in the schematic. Hopefully you find something that needs repair. If not then it's some thing in the digital front end and/ or the display ( likely the digital front end and hard to find parts and troubleshoot. Good luck.

27th October 2011, 05:43 AM	#3
Mohan Siribadda diyAudio Member Join Date: Oct 2008 Location: Sri Lanka	Thanks, I will checik

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